hi, everyone
when I user rest bench testing RGW with cmd : rest-bench --access-key=ak --secret=sk --bucket=bucket --seconds=360 -t 200 -b 524288 --no-cleanup write
I found when RGW call the method "bucket_prepare_op " is very slow. so I observed from 'dump_historic_ops'?to see?
{ "description": "osd_op(client.4211.0:265984 .dir.default.4148.1 [call rgw.bucket_prepare_op] 3.b168f3d0 e37)",
"received_at": "2014-07-03 11:07:02.465700",
"age": "308.315230",
"duration": "3.401743",
"type_data": [
"commit sent; apply or cleanup",
{ "client": "client.4211",
"tid": 265984},
[
{ "time": "2014-07-03 11:07:02.465852",
"event": "waiting_for_osdmap"},
{ "time": "2014-07-03 11:07:02.465875",
"event": "queue op_wq"},
{ "time": "2014-07-03 11:07:03.729087",
"event": "reached_pg"},
{ "time": "2014-07-03 11:07:03.729120",
"event": "started"},
{ "time": "2014-07-03 11:07:03.729126",
"event": "started"},
{ "time": "2014-07-03 11:07:03.804366",
"event": "waiting for subops from [19,9]"},
{ "time": "2014-07-03 11:07:03.804431",
"event": "commit_queued_for_journal_write"},
{ "time": "2014-07-03 11:07:03.804509",
"event": "write_thread_in_journal_buffer"},
{ "time": "2014-07-03 11:07:03.934419",
"event": "journaled_completion_queued"},
{ "time": "2014-07-03 11:07:05.297282",
"event": "sub_op_commit_rec"},
{ "time": "2014-07-03 11:07:05.297319",
"event": "sub_op_commit_rec"},
{ "time": "2014-07-03 11:07:05.311217",
"event": "op_applied"},
{ "time": "2014-07-03 11:07:05.867384",
"event": "op_commit finish lock"},
{ "time": "2014-07-03 11:07:05.867385",
"event": "op_commit"},
{ "time": "2014-07-03 11:07:05.867424",
"event": "commit_sent"},
{ "time": "2014-07-03 11:07:05.867428",
"event": "op_commit finish"},
{ "time": "2014-07-03 11:07:05.867443",
"event": "done"}]]}]}
so I find 2 performance degradation. one is from "queue op_wq" to "reached_pg" , anothor is from "journaled_completion_queued" to "op_commit".
and I must stess that there are so many ops write to one bucket object, so how to reduce Latency ?
baijiaruo at 126.com
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